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Transconductance and input impedance of simple two-stage amplifier

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promach

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The absolute value of this transconductance equals half the transconductance of each side of the input pair.

the input impedance rp3//cp3 equals half that of the individual transistors T2a and T2b
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For this simple two-stage amplifier circuit , could anyone help to explain the two sentences above ?


Transconductance and input impedance of simple two-stage amplifier.png
 

The second is wrong, I believe. I would expect double impedance. Capacitance component under the assumption of an ideal current source.
 

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